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Dynamics of photoinduced species, as a key parameter for nanomaterials plays a significantly role in the performance of optoelectronic devices. In this work, the origin of broadband optical response for the emerging Ti3C2Tx MXene is revealed by transient spectroscopic analysis. From ultraviolet to infrared, the steady-state and transient optical responses present wavelength-related features. The carrier lifetime is found to change from femtosecond to nanosecond time scale dominated by various photoinduced species, i.e., carrier and surface plasmon. The unique optoelectronic character enables photodetection. This fundamental study on carrier, plasmon dynamics, and application in photodetection is helpful for exploring MXene-based optoelectronic devices.

Unlike traditional two-dimensional layered materials, tellurium (Te) shows its one-dimensional van der Waals structure and triggers intensive researches. Through a density functional theory coupled with the nonequilibrium Green’s function calculation, we found that bilayer tellurene has a broad photoelectric response over the range from the visible to the near-infrared region. Besides, bilayer tellurene photodetector presents an ultra-strong anisotropic photo-responsivity and an ultra-high extinction ratio (~2812 at the photon energy of 3.4 eV) because of its non-layer/chain structure, which is superior to the antimonene (~145) and phosphorene/blue phosphorene bilayers (~240). Time-domain first principle study further reveals that the ultra-strong anisotropy comes from the transition of Te 5p bonding orbitals along or perpendicular to the chain directions. With these excellent optoelectronic merits, bilayer tellurene may become a promising candidate for next-generation photoelectronic devices.

Transgender and nonbinary (TNB) individuals are at increased risk for depression, making it important to understand the factors that may contribute to or attenuate this disparity. Community connectedness is one such factor, but prior research regarding its effect on depression has been mixed. It is possible that these mixed findings may be because community connectedness leads to multiple types of self-focused attention (i.e., gender reflection, gender rumination, and preoccupation with others' perceptions) which then have opposing effects on depression. To explore this possibility, the current study sought to test a mediation model in which the three types of self-focused attention would mediate the relationship between community connectedness and depression. Cross-sectional data were collected using online surveys with 309 TNB young adults aged 18–30 years old. As hypothesized, preoccupation with others' perceptions was a significant mediator explaining 35.85% of the variance in depression. Contrary to expectations, gender reflection and gender rumination were not significant mediators. However, community connectedness significantly predicted greater gender reflection, while gender rumination predicted greater depression. The present results indicate that different types of self-focused attention have differing effects on depression in this population, suggesting that clinicians working with TNB young adults should target the ways that these clients think about their gender identity. Additionally, connection to the TNB community can have multiple effects on thought processes, and efforts should be made to maximize the benefits while minimizing the costs. Future research should test these relationships using longitudinal designs and at different ages, as well as assess whether aspects of the community connectedness itself (e.g., co-rumination in TNB spaces, online vs. in-person connection) may have different effects. [ABSTRACT FROM AUTHOR]

Intimate partner violence (IPV) is prevalent among young sexual and gender minorities assigned male at birth (YSGM-AMAB). However, few studies have examined the chronicity or distinguished between minor and severe forms of IPV among YSGM-AMAB. Furthermore, while past research has documented differences in IPV by race/ethnicity, sexual identity, gender identity, income, and education in other populations, few studies have examined these sociodemographic characteristics in relation to IPV in YSGM-AMAB. Thus, the present study aims to: (1) estimate past year prevalence and chronicity of minor and severe forms of IPV victimization and perpetration in a diverse sample of (N = 665) YSGM-AMAB in New York City, and (2) examine differences in IPV prevalence and chronicity by the aforementioned sociodemographic characteristics. Cross-sectional data from [BLINDED] informed these descriptive and inferential analyses. Nearly half of all participants reported past year IPV victimization and approximately 40% reported perpetration. Psychological violence was the most common form of victimization, followed by sexual, physical, and injury victimization. Psychological violence was the most common form of perpetration, followed by physical, sexual, and injury perpetration. Regarding sociodemographic differences in last year IPV prevalence, bisexual, transgender, and lower income YSGM-AMAB were more likely to report several subtypes of IPV victimization. Whereas Asian/API, bisexual, transgender, and lower income participants were more likely to report several subtypes of IPV perpetration. Regarding last year IPV chronicity, non-graduate YSGM-AMAB reported more instances of two subtypes of IPV victimization, while Black, White, cisgender, upper income, non-graduate participants reported more instances of several subtypes of IPV perpetration. These findings may be used to develop IPV prevention and intervention programs, inform future research endeavors, and develop and strengthen policies that reduce sociodemographic inequalities and promote more favorable sociopolitical conditions for YSGM-AMAB. [ABSTRACT FROM AUTHOR]

Two-dimensional (2D) indium selenide (InSe) has been widely studied for application in transistors and photodetectors, which benefit from its excellent optoelectronic properties. Among the three specific polytypes (γ -, ϵ - and β -phase) of InSe, only the crystal lattice of InSe in β -phase (β -InSe) belongs to a non-symmetry point group of |$D_{6h}^4$|⁠ , which indicates stronger anisotropic transport behavior and potential in the polarized photodetection of β -InSe-based optoelectronic devices. Therefore, we prepare the stable p-type 2D-layered β -InSe via temperature gradient method. The anisotropic Raman, transport and photoresponse properties of β -InSe have been experimentally and theoretically proven, showing that the β -InSe-based device has a ratio of 3.76 for the maximum to minimum dark current at two orthogonal orientations and a high photocurrent anisotropic ratio of 0.70 at 1 V bias voltage, respectively. The appealing anisotropic properties demonstrated in this work clearly identify β -InSe as a competitive candidate for filter-free polarization-sensitive photodetectors. [ABSTRACT FROM AUTHOR]

Unlike traditional two-dimensional layered materials, tellurium (Te) shows its one-dimensional van der Waals structure and triggers intensive researches. Through a density functional theory coupled with the nonequilibrium Green's function calculation, we found that bilayer tellurene has a broad photoelectric response over the range from the visible to the near-infrared region. Besides, bilayer tellurene photodetector presents an ultra-strong anisotropic photo-responsivity and an ultra-high extinction ratio (~2812 at the photon energy of 3.4 eV) because of its non-layer/chain structure, which is superior to the antimonene (~145) and phosphorene/blue phosphorene bilayers (~240). Time-domain first principle study further reveals that the ultra-strong anisotropy comes from the transition of Te 5p bonding orbitals along or perpendicular to the chain directions. With these excellent optoelectronic merits, bilayer tellurene may become a promising candidate for next-generation photoelectronic devices. [ABSTRACT FROM AUTHOR]